Progressive power lens pair, method for designing progressive power lens pair and method for manufacturing progressive power lens pair

Abstract

A progressive power lens pair is provided with an object-side surface and an eyeball-side surface of the right-eye lens and an object-side surface and an eyeball-side surface of the left-eye lens which are set by ensuring that ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other, when prescribed additional power for the right-eye lens and prescribed additional power for the left-eye lens are equal to each other; and prescription information for the progressive power lens pair indicates: that spherical power SR at the right-eye lens and spherical power SL at the left-eye lens are different from each other, that astigmatic power CR at the right-eye lens and astigmatic power CL at the left-eye lens are different from each other, or that an astigmatism axis angle AxR corresponding to the right-eye lens and an astigmatism axis angle AxL corresponding to the left-eye lens are different from each other.

1 . A progressive power lens pair, comprising a left-eye lens and a right-eye lens each having a distance zone suited for distance vision, a near zone set at a position different from a position of the distance zone and achieving refractive power suited for near vision and a progressive zone located between the distance zone and the near zone, where refractive power changes continuously, wherein:
 an object-side surface and an eyeball-side surface of the right-eye lens and an object-side surface and an eyeball-side surface of the left-eye lens are set by ensuring that ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other,   
       with ADDR1 and ADDR2 respectively representing surface additional power at the object-side surface and surface additional power at the eyeball-side surface of the right-eye lens, and 
       with ADDL1 and ADDL2 respectively representing surface additional power at the object-side surface and surface additional power at the eyeball-side surface of the left-eye lens, 
       when prescribed additional power for the right-eye lens and prescribed additional power for the left-eye lens are equal to each other in the progressive power lens pair; and
 prescription information for the progressive power lens pair indicates: 
 that spherical power SR at the right-eye lens and spherical power SL at the left-eye lens are different from each other, 
 that astigmatic power CR at the right-eye lens and astigmatic power CL at the left-eye lens are different from each other, or 
 that an astigmatism axis angle AxR corresponding to the right-eye lens and an astigmatism axis angle AxL corresponding to the left-eye lens are different from each other. 
 
     
     
         2 . The progressive power lens pair according to  claim 1 , wherein:
 ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other when a spherical equivalent SR+CR/2 for the right-eye lens and a spherical equivalent SL+CL/2 for the left-eye lens are different from each other.   
     
     
         3 . The progressive power lens pair according to  claim 1 , wherein:
 BCRf representing a distance zone base curve at the objective side surface of the right-eye lens and BCLf representing a distance zone base curve at the object-side surface of the left-eye lens are different from each other, when the spherical power SR at the right-eye lens and a spherical power SL at the left lens are different from each other, or a spherical equivalent SR+CR/2 for the right-eye lens and the spherical equivalent SL+CL/2 for the left-eye lens are different from each other.   
     
     
         4 . The progressive power lens pair according to  claim 1 , that satisfies a condition expressed as;
   when  SL<SR ,ADD R 1<ADD L 1; and     when  SR<SL ,ADD L 1<ADD R 1   
       with respect to the spherical power SR at the right-eye lens and the spherical power SL at the left-eye lens. 
     
     
         5 . The progressive power lens pair according to  claim 2 , that satisfies a condition expressed as;
   when  SL+CL/ 2< SR+CR/ 2,ADD R 1<ADD L 1; and     when  SR+CR/ 2< SL+CL/ 2,ADD L 1<ADD R 1   
       with respect to the spherical equivalent SR+CR/2 for the right-eye lens and the spherical equivalent SL+CL/2 for the left-eye lens. 
     
     
         6 . The progressive power lens pair according to  claim 1 , that satisfies a condition expressed as;
   when  SVL<SVR ,ADD R 1<ADD L 1,     when  SVR<SVL ,ADD L 1<ADD R 1   
       with respect to SVR for the right-eye lens calculated as SVR=SR+CR×(sin(AxR)){circumflex over ( )}2 and SVL for the left-eye lens calculated as SVL=SL+CL×(sin(AxL)){circumflex over ( )}2. 
     
     
         7 . The progressive power lens pair according to  claim 1 , that satisfies a condition expressed in units of diopters as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|≤4  (1).
   
     
     
         8 . The progressive power lens pair according to  claim 1 , that satisfies a condition expressed as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|/| SR−SL|≤ 16  (2)
   
       when the spherical power SR at the right-eye lens and the spherical power SL at the left-eye lens are different from each other. 
     
     
         9 . The progressive power lens pair according to  claim 1 , that satisfies a condition expressed as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|/|( SR+CR/ 2)−( SL+CL/ 2)|≤32  (3)
   
       when a spherical equivalent SR+CR/2 for the right-eye lens and a spherical equivalent SL+CL/2 for the left-eye lens take values different from each other. 
     
     
         10 . The progressive power lens pair according to  claim 1 , wherein:
 SVR for the right-eye lens calculated as; SVR=SR+CR×(sin(AxR)){circumflex over ( )}2, and SVL for the left-eye lens calculated as; SVL=SL+CL×(sin(AxL)){circumflex over ( )}2, are different from each other; and   a condition expressed as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|/|( SVR−SVL )|≤16  (4)
 
   
       is satisfied. 
     
     
         11 . The progressive power lens pair according to  claim 1 , wherein:
 a condition expressed in units of diopters as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|≤4  (1)
 
   
       is satisfied when a condition expressed in units of millimeters as;
   0≤|(SAG1 R ( xtR,ytR )−SAG1 R ( xbR,ybR ))−SAG1 L ( xtL,ytL )−SAG1 L ( xbL,ybL ))≤4  (5)
 
 
       is satisfied, 
       with SAG 1 R(x, y) indicating a sag quantity representing an extent of sag measured along an optical axis in relation to the right-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the right-eye lens and ranging perpendicular to the optical axis of the right-eye lens, 
       with SAG 1 L(x, y) indicating a sag quantity measured along an optical axis in relation to the left-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the left-eye lens and ranging perpendicular to the optical axis of the left-eye lens, 
       with (xtR, ytR) and (xbR, ybR) respectively indicating a coordinate point at which a straight line passing through a position taken by the optical axis of the right-eye lens fitted inside a frame and extending along an up/down direction intersects a top end of the frame and a coordinate point at which the straight line intersects a bottom end of the frame; and 
       with (xtL, ytL) and (xbL, ybL) respectively indicating a coordinate point at which straight line passing through a position taken by the optical axis of the left-eye lens fitted inside the frame, and extending along an up/down direction intersects a top end of the frame and a coordinate point at which the straight line intersects the bottom end of the frame. 
     
     
         12 . The progressive power lens pair according to  claim 1 , wherein:
 a condition expressed in units of diopters as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|≤4  (1)
 
   
       is satisfied when a condition expressed in units of millimeters as;
   0≤|(SAG1 R ( xbR,ybR )−SAG1 L ( xbL,ybL )|≤4  (6)
 
 
       is satisfied, 
       with SAG 1 R(x, y) indicating a sag quantity measured along an optical axis in relation to the right-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the right-eye lens and ranging perpendicular to the optical axis of the right-eye lens, 
       with SAG 1 L(x, y) indicating a sag quantity measured along an optical axis in relation to the left-eye lens at a coordinate point (x, y) taken on a plane passing through the object-side vertex of the left-eye lens and ranging perpendicular to the optical axis of the left-eye lens, 
       with (xbR, ybR) indicating a coordinate point at which a straight line passing through a position taken by the optical axis of the right-eye lens fitted inside a frame, and extending along an up/down direction, intersects a bottom end of the frame; and 
       with (xbL, ybL) indicating a coordinate point at which a straight line passing through a position taken by the optical axis of the left-eye lens fitted inside a frame, and extending along the up/down direction, intersects the bottom and of the frame. 
     
     
         13 . The progressive power lens pair according to  claim 1 , wherein:
 a condition expressed in units of diopters as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|≤4  (1)
 
   
       is satisfied when a condition expressed in units of degrees as;
   0≤θ R−θL|≤ 5  (7)
 
 
       is satisfied 
       with SAG 1 R(x, y) indicating a sag quantity measured along an optical axis in relation to the right-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the right-eye lens and ranging perpendicular to an optical axis of the right-eye lens, 
       with SAG 1 L(x, y) indicating a sag quantity measured along an optical axis in relation to the left-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the left-eye lens and ranging perpendicular to the optical axis of the left-eye lens, 
       with (xtR, ytR) and (xbR, ybR) respectively indicating a coordinate point at which a straight line passing through a position taken by the optical axis of the right-eye lens fitted inside a frame, and extending along an up/down direction intersects a top end of the frame, and coordinate point at which the straight line intersects a bottom end of the frame, 
       with (xtL, ytL) and (xbL, ybL) respectively indicating a coordinate point at which a straight line passing through a position taken by the optical axis of the left-eye lens fitted inside a frame, and extending along an up/down direction intersects a top end of the frame and a coordinate point at which the straight line intersects a bottom end of the frame; and 
       with angles θR and θL calculated as;
   Δθ R=a  tan((SAG1 R ( xtR,ytR )−SAG1 R ( xbR,ybR ))/( ytR−ybR )) and
 
   Δθ L=a  tan((SAG1 L ( xtL,ytL )−SAG1 L ( xbL,ybL ))/( ytL−ybL )).
 
 
     
     
         14 . The progressive power lens pair according to  claim 1 , wherein:
 a condition expressed in units of diopters as;
   0<|(ADD R 1−ADD R 2)−(ADD L 1−ADD L 2)|≤4  (1)
 
   
       is satisfied, when a condition expressed in units of millimeters as;
   0≤|(SAG1 R ( x,y )−SAG1 L ( x′,y ′)|≤4  (8)
 
 
       is satisfied on a frame perimeter with respect to a sag quantity SAG 1 R(x, y) for the right-eye lens and a sag quantity SAG 1 L(x′, y′) for the left-eye lens; 
       with SAG 1 R(x, y) indicating a sag quantity measured along an optical axis in relation to the right-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the right-eye lens and ranging perpendicular to the optical axis of the right-eye lens, 
       with SAG 1 L(x, y) indicating a sag quantity measured along the optical axis in relation to the left-eye lens at a coordinate point (x, y) taken on a plane passing through an object-side vertex of the left-eye lens and ranging perpendicular to the optical axis of the left-eye lens; (xtR, ytR) and 
       with (x′, y′) indicating a coordinate point taken at a position on a left-eye frame that achieves symmetry to the coordinate point (x, y) on a right-eye frame. 
     
     
         15 . The progressive power lens pair according to  claim 1 , wherein:
 ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other in order to reduce a difference between an angle of deviation at the right-eye lens and an angle of deviation at the left-eye lens.   
     
     
         16 . A progressive power lens pair, comprising a left-eye lens and a right-eye lens each having a distance zone suited for distance vision, a near zone set at a position different from a position of the distance zone and achieving refractive power suited for near vision, and a progressive zone located between the distance zone and the near zone, where refractive power changes continuously, wherein:
 an object-side surface and an eyeball-side surface of the right-eye lens and an object-side surface and an eyeball-side surface of the left-eye lens are set by ensuring that ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other,   
       with ADDR1 and ADDR2 respectively representing surface additional power at the object-side surface and surface additional power at the eyeball-side surface of the right-eye lens; and 
       with ADDL1 and ADDL2 respectively representing surface additional power at the object-side surface and surface additional power at the eyeball-side surface of the left-eye lens, 
       when wear additional power ADDR for the right-eye lens and wear additional power ADDL for the left-eye lens are equal to each other in the progressive power lens pair; and
 a comparison parameter calculated based upon at least one set of information, among sets of information DFR_max, DFR_min, DFR, DNR_max, DNR_min, DNR, ADDR, θInsR and DR for the right-eye lens and a comparison parameter calculated based upon at least one set of information among sets of information DFL_max, −DFLmin, DFL, DNL_max, DNL_min, DNL, ADDL, θInsL and DL for the left-eye lens take values different from each other, 
 
       with DFR_max, DFR_min and DFR=(DFR_max+DFR_min)/2 respectively representing maximum refractive power, minimum refractive power and average refractive power with respect to refraction of a transmitted light beam passing through a far reference point at the right-eye lens, with DNR_max, DNR_min and DNR=(DNR_max+DNR_min)/2 respectively representing maximum refractive power, minimum refractive power and average refractive power with respect to refraction of a transmitted light beam passing through a near reference point at the right-eye lens, with ADDR=DNR−DFR representing the wear additional power calculated as an average refractive power difference between the far reference point and the near reference point at the right-eye lens, and with θInsR representing an inset angle at the right-eye lens and DR representing an outer diameter of the right-eye lens; and 
       with DFL_max, DFL_min and DFL=(DFL_max+DFL_min)/2 respectively representing maximum refractive power, minimum refractive power and average refractive power with respect to refraction of a transmitted light beam passing through a far reference point at the left-eye lens, with DNL_max, DNL_min and DNL=(DNL_max+DNL_min)/2 respectively representing maximum refractive power, minimum refractive power and average refractive power with respect to refraction of a transmitted light beam passing through a near reference point at the left-eye lens, with ADDL=DNL−DFL representing the wear additional power calculated as an average refractive power difference between the far reference point and the near reference point at the left-eye lens, and with θInsL representing the inset angle at the left-eye lens and DL representing an outer diameter of the left-eye lens. 
     
     
         17 . The progressive power lens pair according to  claim 16 , wherein:
 the comparison parameter is at least one of, a prescribed spherical power, a prescribed astigmatic power, a prescribed astigmatism axis angle, and SVR corresponding to the right-eye lens or SVL corresponding to the left-eye lens, with respect to a wearer of the progressive power lens pair, and   
       SVR for the right-eye lens and SVL for the left-eye lens are expressed as;
     SVR=SR+CR ×(sin( AxR )){circumflex over ( )}2
 
     SVL=SL+CL ×(sin( AxL )){circumflex over ( )}2.
 
 
     
     
         18 . A method for designing a progressive power lens pair with a left-eye lens and a right-eye lens each having a distance zone suitable for distance vision, a near zone located at a position different from a position of the distance zone and suited for near vision and a progressive zone located between the distance zone and the near zone, where refractive power changes continuously, comprising steps of:
 obtaining prescription information pertaining to a wearer; and   setting design parameters so as to ensure that ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other,   
       with ADDR1 and ADDR2 respectively representing surface additional power at an object-side surface and surface additional power at an eyeball-side surface of the right-eye lens and ADDL1 and ADDL2 respectively representing surface additional power at an object-side surface and surface additional power at an eyeball-side surface of the left-eye lens, 
       when prescribed additional power for the right-eye lens and prescribed additional power for the left-eye lens are equal to each other in the progressive power lens pair; and 
       prescription information for the progressive power lens pair indicates:
 that power SVR along an up/down direction achieved at an optical center of the right-eye lens and power SVL along the up/down direction achieved at an optical center of the left-eye lens are different from each other, or 
 that spherical power SR at the right-eye lens and spherical power SL at the left-eye lens are different from each other, 
 that astigmatic power CR at the right-eye lens and astigmatic power CL at the left-eye lens are different from each other, or 
 that an astigmatism axis angle AxR corresponding to the right-eye lens and an astigmatism axis angle AxL corresponding to the left-eye lens are different from each other. 
 
     
     
         19 . The method for designing a progressive power lens pair according to  claim 18 , wherein:
 a value calculated as (ADDR1−ADDR2)−(ADDL1−ADDL2) is set based upon sight-line information obtained through detection executed on a wearer wearing a reference progressive power lens pair assuming equal values for ADDR1−ADDR2 and ADDL1−ADDL2.   
     
     
         20 . The method for designing a progressive power lens pair according to  claim 18 , wherein:
 a value calculated as (ADDR1−ADDR2)−(ADDL1−ADDL2) is set based upon an offset between a position at which an object can be viewed at a near reference point of the right-eye lens and a position at which the object can be viewed at a near reference point of the left-eye lens, detected on a wearer wearing a reference progressive power lens pair assuming equal values for ADDR1−ADDR2 and ADDL1−ADDL2.   
     
     
         21 . The method for designing a progressive power lens pair according to  claim 18 , wherein:
 ADDR1−ADDR2 and ADDL1−ADDL2 take values different from each other in order to reduce a difference between an angle of deviation at the right-eye lens and an angle of deviation at the left-eye lens when setting the design parameters.   
     
     
         22 . A method for manufacturing a progressive power lens pair, comprising steps of:
 designing the progressive power lens pair through the method for designing according to  claim 18 ; and   manufacturing the progressive power lens pair designed through the method for designing.